TY  - BOOK
AU  - . Barck.,O. T
AU  - Blake, N. M
TI  - SCIENCE 1900: A History of united States in our tyme 
U1  - 973.9 
PY  - 1962///
CY  - London
PB  - macmilan company
KW  - SCIENCE
N1  - Include index
ER  -